Electrical Concepts

Question 1

What are the two kinds of charge?

Answer 1

Positive and negative

Question 2

Are materials with different (opposite) charges attracted or repelled by each other?

Answer 2

Attracted

Question 3

Are materials with the same charge repelled or attracted to each other?

Answer 3

Repelled

Question 4

What is an electric field?

Answer 4

A region of space where charge experiences an electrical force

Question 5

What is the unit of charge?

Answer 5

Coulomb

Question 6

What direction does a positive charge face?

Answer 6

The direction of an electric field

Question 7

What’s direction does a negative charge face?

Answer 7

The opposite direction of the field

Question 8

What is a conductor?

Answer 8

A material in which charge carriers can move

Question 9

What are the charge carriers that are usually in solids?

Answer 9

Electrons

Question 10

What are some good conductors?

Answer 10

Iron, copper, brass, aluminium and graphite (carbon)

Question 11

What are liquid conductors?

Answer 11

Usually positive and negative ions of dissolved materials

Question 12

Is water a conductor? If yes, give an example how

Answer 12

Yes. This is why it’s dangerous to when water comes into contact with mains electricity

Question 13

What is an insulator? Give examples

Answer 13

A material in which charge carriers cannot move. Such as glass, polythene and rubber

Question 14

Can charge flow when there is no complete path of conductors or a source of electrical energy?

Answer 14

No

Question 15

What is a complete path of conductors called?

Answer 15

An electrical circuit

Question 16

What happens when a supply is switched on?

Answer 16

It applies an electrical field to the conductors in a circuit

Question 17

What does the electrical force cause?

Answer 17

It causes charge carriers to flow

Question 18

What is a flow of charge called in a conductor?

Answer 18

A current

Question 19

What is the SI unit of current?

Answer 19

Ampere (A)

Question 20

What is the symbol for current used in SQA

Answer 20

I

Question 21

What is the relationship between charge, current and time?

Answer 21

Q=It

Question 22

If an electrical torch is switch on for 30 minutes. The current in the bulb of the torch is 0.45A. Then calculate the charge that flows through the bulb

Answer 22

I= 0.45A
t= 30 minutes= 1800s
Q=It
=0.45 X 1800
=810C

Question 23

What is used when an electrical force causes charge to move? And what is done?

Answer 23

Electrical energy is used and work is done